$(document).ready(function(){

	$('.b-visual-nw').stop().animate({ backgroundPosition: '(50% 0)' }, { duration: 100 });
	$('.pic-arr-prev')
		.mouseover(function() {
			$('.b-visual-nw').stop().animate({ backgroundPosition: '(0% 0)' }, { duration: 2000 });
		})
		.mouseout(function() {
			$('.b-visual-nw').stop();
		});
	$('.pic-arr-next')
		.mouseover(function() {
			$('.b-visual-nw').stop().animate({ backgroundPosition: '(100% 0)' }, { duration: 2000 });
		})
		.mouseout(function() {
			$('.b-visual-nw').stop();
		}); 		
	
});